Calibration Explained

To prove all instruments measuring ability which is reliable and accurate, the results of measurement are to be compared with higher standard instrument of the same kind. The procedure of this is termed as Calibration.

Calibration is done by a sequence of measurements on the device under test (DUT) to a Universally (International/ National) accepted as reference standards. To execute the calibration, the technician takes measurements of several points ranging from zero to full scale and back to zero. For ex, in a pressure gauge calibration, we use pressure source such as hand pump, calibration manifold, volume controller and nitrogen gas to create the pressure necessary to take the sequence of measurements. we use pressure calibrator or pressure test gauge as our reference. once the sequence of measurements are taken, they are compared to the reference standards. 

In the oil and gas industry, pressure and temperature transmitters re very very important. By measuring temperature, pipeline pressure and pressure drop across a restriction (called an Orifice Plate) we can infer the flow of oil or  gas through the pipe at a given time.